Mechanical model to simulate the NSM FRP strips shear strength contribution to a RC beam : influence of each parameter on the force transferred by a single strip to a prism of plain concrete

Abstract

A mechanical model, recently developed to simulate the shear strength contribution provided by a system of Near Surface Mounted (NSM) Fiber Reinforced Polymer (FRP) strips to a Reinforced Concrete (RC) beam throughout its loading process, is applied focusing on the behavior of a single NSM FRP strip orthogonal to the Critical Diagonal Crack (CDC). Firstly, attention is focused on the bond-based behavior of the strip mounted on the relevant prism of surrounding concrete. The influence of each parameter on the peak force transferable through bond stresses to the surrounding concrete, excluding the possibility of either concrete fracture and strip rupture, is analyzed. In the second part of the paper attention is focused on the comprehensive behavior of the strip: the influence of each parameter on the peak force transferable to the surrounding concrete, also including the possibility of both concrete fracture and strip rupture, is analyzed.